GOEXPERIMENT=jsonv2 performance penalty

[robmyersrobmyers]

Note: this is NOT a bug in OPA, but it may bite OPA users like me who enable GOEXPERIMENT=jsonv2 in Go 1.25.

I was surprised to see a roughly 20% performance penalty when enabling the Go 1.25 JSON v2 experiment with my OPA related code.

geomean                           64.06m        77.79m       +21.43%

I think it could be related to this issue: https://github.com/golang/go/issues/75026

For now I'm going to stick with github.com/go-json-experiment/json instead of moving to encoding/json/v2 in go 1.25.

Apologies for not having an OPA specific bench to share, but wanted to raise awareness.

[anderseknert]

Thanks for the heads up!

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